551898820 has 48 divisors (see below), whose sum is σ = 1274370048. Its totient is φ = 199100160.

The previous prime is 551898799. The next prime is 551898821. The reversal of 551898820 is 28898155.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (551898821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18064 + ... + 37816.

It is an arithmetic number, because the mean of its divisors is an integer number (26549376).

Almost surely, 2^551898820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551898820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637185024).

551898820 is an abundant number, since it is smaller than the sum of its proper divisors (722471228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551898820 is a wasteful number, since it uses less digits than its factorization.

551898820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19900 (or 19898 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 46.

The square root of 551898820 is about 23492.5268968666. The cubic root of 551898820 is about 820.2630625348.

It can be divided in two parts, 55189 and 8820, that added together give a square (64009 = 253²).

The spelling of 551898820 in words is "five hundred fifty-one million, eight hundred ninety-eight thousand, eight hundred twenty".